Use the digits from 1 up to 9 and make 100.

Follow the rules.
=> Each digit should be used only once.
=> You can only use addition.
=> For making a number, two single digits can be combined (for example, 4 and 2 can be combined to form 42 or 24)
=> A fraction can also be made by combining the two single digits (for example, 4 and 2 can be combined to form 4/2 or 2/4)

Question: how can we do this?

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Riddle me this, Riddle me that,
What am I? I am made of wood, but you can't see me down?

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You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?